CN114946110A

CN114946110A - Magnetic gear rotating electric machine and manufacturing method

Info

Publication number: CN114946110A
Application number: CN202180009183.1A
Authority: CN
Inventors: 林健太郎; 大平丈夫; 汤下笃
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2020-01-16
Filing date: 2021-01-05
Publication date: 2022-08-26
Also published as: JP2021113566A; EP4075646A1; US20230208271A1; WO2021145232A1; JP7346312B2; EP4075646A4

Abstract

A magnetic gear rotating electrical machine is provided with: a stator; a low-speed rotor provided inside the stator, the low-speed rotor having a plurality of pole pieces arranged in a circumferential direction; a high-speed rotor provided inside the low-speed rotor, the high-speed rotor having a plurality of second magnets as magnets facing the pole pieces; wherein, this magnetism gear rotating electrical machines possesses: a first piezoelectric element provided on the pole piece, for converting vibration and an electric signal; and a control unit connected to the first piezoelectric element, and configured to suppress vibration of the pole piece based on an output voltage of the first piezoelectric element.

Description

Magnetic gear rotating electric machine and manufacturing method

Technical Field

The present disclosure relates to a magnetic gear rotating electrical machine and a manufacturing method.

The present application claims priority to Japanese patent application No. 2020-.

Background

When a wind turbine generator or the like obtains electric power from a relatively low-speed rotation, a method of rotating the generator via a power transmission mechanism such as a speed-up gear is known (for example, patent document 1). On the other hand, since the power transmission mechanism includes a plurality of gears, application thereof to a generator leads to an increase in size of the generator. Therefore, in recent years, it has been considered to use a smaller magnetic gear rotating electric machine instead of a combination of a power transmission mechanism and a generator.

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication No. 2005-091103

Disclosure of Invention

Technical problem to be solved by the invention

In a magnetic gear rotating electrical machine, a plurality of pole pieces (magnetic pieces) are provided on a rotating low-speed rotor. The pole pieces are beam-like structures having both ends of the low-speed rotor formed by bearing wheels, and the both ends are joined by pins or rigidly joined. Therefore, the pole pieces vibrate under the influence of the magnetic fields of the stator and the low-speed rotor as the low-speed rotor rotates. This vibration may damage the pole piece, which may cause a bottleneck in the durability of the magnetic gear rotating electric machine.

An object of the present disclosure is to provide a magnetic gear rotating electrical machine and a manufacturing method that solve the above-described technical problems.

Technical solution for solving technical problem

The disclosed magnetic gear rotating electrical machine is provided with: a stator; a low-speed rotor provided inside the stator, the low-speed rotor having a plurality of pole pieces arranged in a circumferential direction; a high-speed rotor provided inside the low-speed rotor, the low-speed rotor having a plurality of second magnets as magnets facing the pole pieces; the magnetic gear rotating electrical machine includes: a first piezoelectric element provided on the pole piece, for converting vibration and an electric signal; and a control unit connected to the first piezoelectric element, and configured to suppress vibration of the pole piece based on an output voltage of the first piezoelectric element.

The method for manufacturing a magnetic gear rotating electrical machine according to the present disclosure is a method for manufacturing a magnetic gear rotating electrical machine including a stator, a low-speed rotor provided inside the stator and having a plurality of pole pieces arranged in a circumferential direction, and a high-speed rotor provided inside the low-speed rotor and having a plurality of second magnets as magnets opposed to the pole pieces, the method including: arranging a piezoelectric element for converting vibration and an electric signal on the pole piece; and providing a control unit connected to the piezoelectric element and configured to suppress vibration of the pole piece based on an output voltage of the piezoelectric element.

ADVANTAGEOUS EFFECTS OF INVENTION

According to at least one of the above aspects, the durability of the magnetic gear rotary electric machine can be improved by damping the vibration of the low-speed rotor in the magnetic gear rotary electric machine.

Drawings

Fig. 1 is a diagram showing a configuration of a magnetic gear rotating electric machine according to an embodiment.

Fig. 2 is a sectional view of the magnetic gear rotary electric machine in operation according to the embodiment.

Fig. 3 is an example of a cross-sectional view of the magnetic gear rotary electric machine when the magnetic gear rotary electric machine of the embodiment is operated.

Fig. 4 is a diagram showing a piezoelectric element and a control unit according to an embodiment.

Fig. 5 is a diagram showing a piezoelectric element and a control unit according to an embodiment.

Fig. 6 is a diagram showing a virtual inductor circuit according to an embodiment.

FIG. 7 is a line graph showing temperature and capacity values according to one embodiment.

Fig. 8 is a diagram showing a piezoelectric element and a control unit according to an embodiment.

Fig. 9 is a flowchart of an embodiment.

Fig. 10 is a sectional view of the magnetic gear rotary electric machine in operation according to the embodiment.

Fig. 11 is a sectional view of the magnetic gear rotary electric machine according to the embodiment when the magnetic gear rotary electric machine is operated.

Fig. 12 is a schematic block diagram showing a configuration of a computer according to at least one embodiment.

Detailed Description

[ first embodiment ]

(constitution of magnetic Gear rotating machine)

Hereinafter, the first embodiment will be described in detail with reference to the drawings. Fig. 1 is a diagram showing a configuration of a magnetic gear rotating electric machine 10 according to a first embodiment. Magnetic gear rotating electric machine 10 includes stator 100, low-speed rotor 200, high-speed rotor 300, and rotating shaft 400. Stator 100, low-speed rotor 200, and high-speed rotor 300 are concentrically arranged about rotation shaft 400.

Examples of the magnetic gear rotating electrical machine 10 include a magnetic gear motor and a magnetic gear generator.

Stator 100 is disposed outside low-speed rotor 200 and high-speed rotor 300. The stator 100 includes a plurality of first magnets 101, which are magnets arranged in a circumferential direction. Examples of the magnet include a permanent magnet and an electromagnet. For example, the stator 100 shown in fig. 1 has twelve first magnets 101 of electromagnets.

In the following description, the number of components will be described with reference to fig. 1, but the number of components is merely one row, and the number of components may be different in other embodiments. The first magnetic body 101 is formed of an unshown iron core and an unshown coil. As the drive current, a three-phase alternating current is supplied from an external drive device (for example, an inverter) to the coil of the first magnet 101. The first magnet 101 has the same polarity as the side facing the low-speed rotor 200, and is provided with, for example, an S-pole.

Low-speed rotor 200 is disposed between stator 100 and high-speed rotor 300. Fig. 2 is a sectional view of the magnetic gear rotary electric machine 10. Low-speed rotor 200 includes first support wheel 206A, second support wheel 206B, and a plurality of pole pieces 201. For example, low speed rotor 200 has thirty-two pole pieces 201. The first support wheel 206A and the second support wheel 206B are disk-shaped members that support both ends of the low-speed rotor 200. First support wheel 206A and second support wheel 206B are fixed to rotation shaft 400 and rotate together with rotation shaft 400.

The plurality of pole pieces 201 are arranged around the shaft at equal intervals. Each pole piece 201 is provided with a magnet. The polarity of the magnet provided in the pole piece 201 on the side facing the stator 100 is the same as that of the first magnet 101, and is provided as an S-pole, for example. Each of both ends of the plurality of pole pieces 201 is fixed to a first support wheel 206A and a second support wheel 206B by a fixing member 202. In the case where the fixing member 202 is a pin, the pin is attached to four corners of the pole piece 201. For the low-speed rotor 200, each pole piece 201 has two fixing members 202, i.e., a fixing member 202A and a fixing member 202B. That is, low-speed rotor 200 includes sixty-four stator 202.

The pole piece 201 includes a first piezoelectric element 203 and a control unit 204. A first piezoelectric element 203 is disposed in the pole piece 201 in the vicinity of the mount 202. More specifically, the first piezoelectric element 203 is provided so as to straddle a line segment connecting two pins of the fixing member 202A (or the fixing member 202B) and so as to have its center located closer to the center of the pole piece 201 than the line segment. This position is a portion of the pole piece 201 where the maximum strain is generated by the rotation of the low-speed rotor 200. As for the first piezoelectric element 203, two first piezoelectric elements 203, i.e., a first piezoelectric element 203A and a first piezoelectric element 203B, are provided at each pole piece 201. That is, sixty-four first piezoelectric elements 203 are provided in the low-speed rotor 200. The first piezoelectric element 203 converts the vibration of the pole piece 201 and an electric signal.

Fig. 3 is an example of a cross-sectional view of the magnetic gear rotary electric machine 10 when the magnetic gear rotary electric machine 10 is operating. That is, fig. 3 is an example of a cross-sectional view of the magnetic gear rotating electric machine 10 when the stator 100, the low-speed rotor 200, and the high-speed rotor 300 that constitute the magnetic gear rotating electric machine 10 rotate. As shown in fig. 3, when the magnetic gear rotating electrical machine 10 is operated, the central portion of the pole piece 201, which is apart from the stator 202, of the pole piece 201 is deformed in the Z direction by the magnetic force of the stator 100 and the high-speed rotor 300 and the centrifugal force. In this way, when the magnetic gear rotating electric machine 10 rotates, the pole piece 201 vibrates in the + Z direction and the-Z direction by the force in the Z direction acting on the pole piece 201.

As in fig. 3, in the case where the deformation of the pole piece 201 occurs, by providing the first piezoelectric element 203 in the vicinity of the fixing member 202 where the deformation is the largest, the first piezoelectric element 203 can maximize the electric signal converted from the vibration accompanying the deformation. The first piezoelectric element 203 is provided in the vicinity of the fixed member 202 as shown in fig. 2, and can be provided at another estimated position if deformation of a predetermined value or more occurs. The predetermined value is set to a value obtained by subtracting a predetermined margin from the maximum value of the estimated magnitude of the distortion when the pole piece 201 is generated, for example.

High-speed rotor 300 is disposed inside stator 100 and low-speed rotor 200. The high-speed rotor 300 includes a plurality of second magnets 301 as magnets opposed to the first magnets 101. The second magnet 301 is a permanent magnet, and the second magnet 301S having an S-pole and the second magnet 301N having an N-pole can be cited. The second magnet 301S and the second magnet 301N are provided in the same number. For example, the high-speed rotor 300 shown in fig. 1 includes four second magnets 301S and four second magnets 301N. The second magnets 301N and 301S are arranged so as to be alternately arranged.

The rotary shaft 400 is disposed inside the stator 100, the low-speed rotor 200, and the high-speed rotor 300.

The first piezoelectric element 203 is connected to the control unit 204 through a wire 7. The control unit 204 is connected to the first piezoelectric element 203 to form a closed circuit, and outputs a current to simulate a virtual impedance based on an output voltage which is an electrical signal of the first piezoelectric element 203. Specifically, if the first piezoelectric element 203 is represented by an equivalent circuit, a closed circuit is configured as shown in fig. 4. Fig. 4 shows an example in which the first piezoelectric element 203 is equivalently represented by using the equivalent resistance component Rp, the equivalent capacitance component Cp, and the equivalent ac voltage source Vp. Since the first piezoelectric element 203 includes a capacitive element, the equivalent circuit also includes an equivalent capacitance component Cp. The first piezoelectric element 203 can be represented as an equivalent circuit in which the equivalent resistance component Rp, the equivalent capacitance component Cp, and the equivalent ac voltage source Vp are connected in series.

The control unit 204 operates as a resonance circuit that resonates at the natural frequency of the pole piece 201, in a closed circuit formed by the first piezoelectric element 203 and the control unit 204. Specifically, in the closed circuit shown in fig. 4, the vibration can be suppressed by setting the inside of the control section 204 to an appropriate impedance state with respect to the impedance (particularly, the equivalent capacitance component Cp) of the first piezoelectric element 203. Hereinafter, the virtual impedance inside the control unit 204 is referred to as a virtual impedance.

The control unit 204 adjusts the output current so that a desired impedance is simulated as a virtual impedance. That is, the internal impedance of the control unit 204 when viewed from the outside is adjusted by adjusting the output current. The output of the current is realized by, for example, a current source (e.g., a voltage-controlled current source) or the like.

The control section 204 has a controller 211 and a virtual inductance circuit 212. In the present embodiment, the controller 211 estimates the equivalent capacitance component Cp of the first piezoelectric element 203 based on the output voltage of the first piezoelectric element 203. The controller 211 outputs a current to the virtual inductance circuit 212 so that the estimated equivalent capacitance component Cp in the first piezoelectric element 203 and the virtual impedance form a resonance circuit having a resonance frequency equal to the natural frequency of the pole piece 201. That is, the controller 211 outputs a current to the virtual inductance circuit 212 so as to realize a virtual impedance including an appropriate inductance component Lv. In the closed circuit, the virtual impedance is adjusted to form an LC series resonance circuit.

Specifically, the dummy inductance circuit 212 outputs a current so that a dummy impedance constitutes an LR shunt circuit, as shown in fig. 5. The closed circuit as shown in fig. 5 is configured to form an RLC parallel circuit. In this way, by forming a parallel circuit of the two first

piezoelectric elements

203A and 203B, the inductance value necessary for the circuit can be reduced, and the inductance component Lv can be reduced in size.

Then, the inductance component Lv of the virtual impedance is adjusted so that the resonance frequency fr in the RLC parallel circuit becomes equal to the natural frequency fn of the pole piece 201. That is, the inductance component Lv of the virtual impedance is set so that the following relational expression is satisfied.

Number 1

In the formula (1), fn is a natural frequency (natural frequency) and is set in advance according to a member (pole piece 201) to be subjected to vibration control. In the formula (1), 2Cp is a value obtained by adding the equivalent capacitance component Cp of the first piezoelectric element 203A and the equivalent capacitance component Cp of the first piezoelectric element 203B, i.e., 2 Cp. The equivalent capacitance component Cp of the first piezoelectric element 203A and the first piezoelectric element 203B is estimated by a method described later. The inductance component Lv is specified by equation (1).

By determining the inductance component Lv in the virtual impedance in this manner, a resonance circuit corresponding to the natural frequency of the vibration control target can be formed in the closed circuit of the first piezoelectric element 203 and the control unit 204. Therefore, the reactance component of the closed circuit can be set to 0 (or lowered) at the resonance frequency (and including the vicinity of the resonance frequency), and the energy of the vibration can be efficiently consumed as thermal energy at the resistance components (Rp and Rv). Thus, vibration damping can be performed.

That is, in the vibration damping method using the resonance circuit, vibration can be effectively damped at the resonance frequency and the vicinity of the resonance frequency. When a large inductance value is required for the natural vibration number of the vibration control target, if the inductance value is realized by a passive element, the element may be increased in size, and by realizing the inductance component Lp as a virtual impedance, the increase in size can be suppressed. Further, since there is an accuracy error in the passive element and the inductance component Lp is realized virtually, improvement of accuracy can be expected.

Here, a configuration example of the dummy inductance circuit 212 is explained. Fig. 6 is a diagram showing an example of the configuration of the dummy inductance circuit 212.

The dummy inductance circuit 212 includes a current source (voltage-controlled current source) 23, a voltage follower (measuring instrument) 24, and an LPF (low pass filter) 25. The virtual inductance circuit 212 and the first piezoelectric element 203 constitute a closed loop.

An input terminal of the virtual inductance circuit 212 is connected to an input terminal of the current source 23 and an input terminal of the voltage follower 24. The output of the voltage follower 24 is connected to the input of the LPF 25. The output of LPF25 is connected to controller 211. That is, the controller 211 acquires a signal of a low-frequency component of the output voltage of the piezoelectric element. An output terminal of the current source 23 is connected to an output terminal of the dummy inductance circuit 212. The output current of the current source 23 is controlled by the controller 211.

Since the closed circuit with the first piezoelectric element 203 constitutes a resonance circuit, the virtual inductance circuit 212 needs to operate so as to have an inductance component Lv based on equation (1). That is, when the output voltage v1 of the first piezoelectric element 203 is input to the virtual inductor circuit 212, the controller 211 outputs the current i1 ═ Y1v1 (where the admittance Y1 ═ j/ω L) to the virtual inductor circuit 212, thereby configuring the closed loop of the first piezoelectric element 203 and the virtual inductor circuit 212 as a resonance circuit.

That is, the controller 211 estimates the capacitance of the first piezoelectric element 203, and calculates the current i1 based on the capacitance so that the virtual inductance circuit 212 satisfies the admittance Y1 that should be realized.

Next, an example of a method for estimating the equivalent capacitance component Cp of the first piezoelectric element 203 in the control unit 204 will be described. In order to form a resonance circuit, it is necessary to estimate the equivalent capacitance component Cp. However, the characteristics of the first piezoelectric element 203 may change depending on the usage environment such as temperature, and the equivalent capacitance component Cp may also change. Fig. 7 is a diagram showing an example of a relationship between the equivalent capacitance component Cp and the temperature in the first piezoelectric element 203. As shown in fig. 7, the equivalent capacitance component Cp tends to increase with an increase in temperature. In order to find an appropriate equivalent capacitance component Cp according to the usage environment, the control unit 204 estimates the equivalent capacitance component Cp.

Therefore, as shown in fig. 8, in the circuit constituted by the first piezoelectric element 203A and the control unit 204, the current output unit 9 is provided in parallel with the control unit 204. The current output unit 9 outputs a predetermined additional current. That is, the current output unit 9 is a current source, and causes an accessory current for estimating the equivalent capacitance component Cp to flow through the closed circuit. When the additional current is supplied to the first piezoelectric element 203A, the control unit 204 estimates the equivalent capacitance component Cp based on the current flowing through the first piezoelectric element 203A and the output voltage of the first piezoelectric element 203A. The current output unit 9 is provided in the same manner as described above in the circuit including the first piezoelectric element 203B and the control unit 204, and outputs a predetermined load current.

Specifically, the current output unit 9 outputs an additional current having a frequency different from that of the current (current for vibration damping) output by the control unit 204. For example, the frequency of the additional current is set to a lower value than the frequency of the vibration damping current. The frequency of the vibration damping current and the frequency of the additional current are set to have a difference so that the frequency component of the additional current can be separated, for example, by a low-pass filter, a band-pass filter, or the like. The frequency of the additional current may be set to a higher value than the frequency of the vibration damping current.

That is, in the circuit of fig. 8, the additional current and the output voltage of the first piezoelectric element 203 corresponding to the additional current can be separated from other current-voltage components. Therefore, the control unit 204 can estimate the equivalent capacitance component Cp based on the additional current and the output voltage of the first piezoelectric element 203 corresponding to the additional current. For example, in the circuit of fig. 8, if the additional current is and the output voltage of the first piezoelectric element 203 corresponding to the additional current is va, the following relationship of expression (2) is established. Therefore, the equivalent capacitance component Cp of the first piezoelectric element 203 can be estimated based on the relationship of the expression (2).

Number 2

By allowing the additional current to flow separately from the current for vibration control, the equivalent capacitance component Cp can be estimated even during vibration control. That is, the vibration control and the estimation of the equivalent capacitance component Cp can be performed in parallel, and the estimated equivalent capacitance component Cp can be reflected in the vibration control (parallel processing). Further, the vibration control and the estimation of the equivalent capacitance component Cp may be performed by time division (serial processing).

(vibration control System processing flow)

Next, an example of the vibration damping process of the vibration damping system will be described with reference to fig. 9. Fig. 9 is a flowchart showing an example of the vibration damping processing procedure of the present embodiment. The flow shown in fig. 9 is repeatedly executed at a predetermined control cycle in the case where the vibration control target is operated, for example. Note that the processing of fig. 9 may be repeatedly executed at a predetermined control cycle even when the structure (for example, the magnetic gear rotating electrical machine 10) on which the vibration control target is mounted is operated (for example, stopped) without operating (for example, stopping) the vibration control target.

First, the output voltage of the first piezoelectric element 203 is acquired (S101). The output voltage is the output voltage of the first piezoelectric element 203 corresponding to the additional current.

Next, the equivalent capacitance component Cp is estimated based on the additional current and the output voltage of the first piezoelectric element 203 corresponding to the additional current (S102). In S102, the equivalent capacitance component Cp is estimated, for example, using equation (2).

Next, based on the estimated equivalent capacitance component Cp, an inductance component (L value) in the virtual impedance is calculated (S103). In S103, the inductance component Lv is calculated using, for example, the formula (1).

Next, the impedance (virtual impedance) of the RL shunt circuit is set so that the calculated inductance component Lv serves as a reactance component (S104). The resistance (Rv) of the RL shunt circuit is calculated as an optimum value by the same method as the fixed point theory of the tuned mass damper, for example.

Next, a current value for realizing the set virtual impedance is calculated (S105). Then, the current source 23 is controlled to output the calculated current value (S106).

When the magnetic gear electric rotating machine 10 is a magnetic gear motor, the high-speed rotor 300 rotates with the rotation of the low-speed rotor 200. On the other hand, when the magnetic gear rotating electric machine 10 is a magnetic gear generator, the low-speed rotor 200 rotates with the rotation of the high-speed rotor 300. As described above, although the magnetic gear electric rotating machine 10 operates differently between the case of a magnetic gear motor and the case of a magnetic gear generator, the vibration of the pole piece 201 due to the rotation of the low-speed rotor 200 is generated in either case. According to the operation of the magnetic gear rotating electrical machine 10, the vibration of the pole piece 201 can be damped in both the case where the magnetic gear rotating electrical machine 10 is a magnetic gear motor and the case where the magnetic gear generator.

(action & Effect)

The magnetic gear rotating electrical machine 10 of the present disclosure includes: a stator 100; a low-speed rotor 200 provided inside the stator 100 and having a plurality of pole pieces 201 arranged in a circumferential direction; a high-speed rotor 300 provided inside the low-speed rotor 200, and a magnetic gear rotary electric machine 10 having a plurality of second magnets 301 as magnets facing the pole pieces 201, the magnetic gear rotary electric machine including: a first piezoelectric element 203 that is provided on the pole piece 201 and converts vibration and an electric signal; and a control unit 204 connected to the first piezoelectric element 203, for suppressing vibration of the pole piece 201 based on the output voltage of the first piezoelectric element 203.

The magnetic gear rotary electric machine 10 damps the vibration of the pole piece 201 of the low-speed rotor 200 in the magnetic gear rotary electric machine 10. This can improve the durability of the magnetic gear rotating electric machine 10.

The plurality of first magnets 101, which are magnets arranged in a circumferential direction of the magnetic gear rotating electric machine 10, are arranged on the stator 100 or between the stator 100 and the low-speed rotor 200, and the first magnets 101 face the second magnets 301.

The magnetic gear rotating electrical machine 10 damps vibration of the pole piece 201 of the low-speed rotor 200 of the magnetic gear rotating electrical machine 10 including the first magnet 101 in the stator 100. This can improve the durability of the magnetic gear rotating electric machine 10.

The first piezoelectric element 203 of the magnetic gear rotating electrical machine 10 is provided in the vicinity of the stator 202 that fixes the pole piece 201 and the low-speed rotor 200.

The first piezoelectric element 203 is provided in the vicinity of the fixing member 202, which is a portion where the deformation of the pole piece 201 becomes large. This improves the vibration damping effect of the first piezoelectric element 203 in the magnetic gear rotating electrical machine 10.

The magnetic gear rotating electrical machine 10 includes a circuit connected to the first piezoelectric element 203 to form a closed circuit, and the control unit 204 performs control based on an electric signal output from the first piezoelectric element 203 so that the circuit operates as a reactance that cancels out a capacitive element of the first piezoelectric element 203 at the resonance frequency of the pole piece 201.

The magnetic gear rotating electrical machine 10 performs vibration damping in accordance with the resonance frequency of the pole piece 201 that affects the durability of the pole piece 201. This can improve the durability of the magnetic gear rotating electric machine 10.

[ second embodiment ]

Next, the magnetic gear rotary electric machine 10 of the second embodiment will be explained. The second piezoelectric element 205 is provided on the pole piece 201 of the magnetic gear rotating machine 10 according to the second embodiment, and the magnetic gear rotating machine 10 uses the second piezoelectric element 205 to perform vibration damping of the pole piece 201.

Fig. 10 is a diagram showing a configuration of a magnetic gear rotating electric machine 10 according to a second embodiment. As shown in fig. 10, a second piezoelectric element 205 is provided in addition to the first piezoelectric element 203.

The first piezoelectric element 203 transmits an electric signal to the controller 211 of the control unit 204 based on the vibration of the pole piece 201. The controller 211 receives an electric signal from the first piezoelectric element 203 and transmits the electric signal to the second piezoelectric element 205 based on a preset value. The second piezoelectric element 205 receives an electric signal from the controller 211, and converts the electric signal into vibration, thereby damping vibration of the pole piece 201. That is, when pole piece 201 vibrates in the + Z direction, second piezoelectric element 205 vibrates in the-Z direction, and when pole piece 201 vibrates in the-Z direction, second piezoelectric element 205 vibrates in the + Z direction.

(action & Effect)

In the magnetic gear rotating electrical machine 10 of the present disclosure, a second piezoelectric element 205 is provided on the pole piece 201, and converts vibration of the pole piece and an electric signal, and the control unit 204 outputs the electric signal to the second piezoelectric element 205 based on the electric signal output from the first piezoelectric element 203.

In the magnetic gear rotating electrical machine 10, the second piezoelectric element 205 performs vibration control of the pole piece 201 based on the electric signal converted by the first piezoelectric element 203. This can improve the durability of the magnetic gear rotating electric machine 10.

[ other embodiments ]

The embodiment of the magnetic gear rotating electric machine 10 has been described above, but can be implemented as follows.

For example, as shown in fig. 11, the magnetic gear rotary electric machine 10 may be implemented in a configuration in which the stator 202 and the pole piece 201 are clamped, instead of the configuration in which the first support wheel 206A and the second support wheel 206B are provided. This enables the magnetic gear rotating electric machine 10 to be manufactured without providing the fixture 202 or the like.

The first piezoelectric element 203 and the second piezoelectric element 205 may be provided inside the pole piece 201, not on the surface of the pole piece 201. That is, a first piezoelectric element 203 and a second piezoelectric element 205 embedded in the pole piece 201 may be used.

The computer 1100 includes a processor 1110, a main memory 1120, a memory 1130, and an interface 1140.

The controller 211 is installed in the computer 1100. The operations of the processing units are stored in the memory 1130 as programs. The processor 1110 reads a program from the memory 1130, expands the program in the main memory 1120, and executes the above-described processing according to the program. The processor 1110 stores a storage area corresponding to each storage unit in the main memory 1120 according to a program.

The program may be used to implement a part of functions performed in the computer 1100. For example, the program may function in combination with another program already stored in the memory 1130 or in combination with another program installed in another device. In another embodiment, the computer 1100 includes a custom lsi (large Scale Integrated circuit) such as pld (programmable Logic device) in addition to or instead of the above configuration. Examples of PLDs include PAL (Programmable Array Logic), GAL (generic Array Logic), CPLD (Complex Programmable Logic device), and FPGA (field Programmable Gate Array). In this case, a part or all of the functions implemented by the processor 1110 may be implemented by the integrated circuit.

Examples of the memory 1130 include a magnetic disk, an optical magnetic disk, a semiconductor memory, and the like. The memory 1130 may be an internal medium directly connected to a bus of the computer 1100, or may be an external medium connected to the computer via the interface 1140 or a communication line. When the program is transferred to the computer 1100 through the communication line, the computer 1100 that receives the information may expand the program in the main memory 1120 and execute the processing described above. In at least one implementation, the memory 1130 is a non-transitory tangible storage medium.

Also, the program may be used to realize a part of the aforementioned functions. In addition, the program can be realized by combining the aforementioned functions with other programs already stored in the memory 1130, that is, a differential file (differential program).

[ accompanying notes ]

The magnetic gear rotating electrical machine 10 according to each embodiment can be understood as follows, for example.

(1) The magnetic gear rotating electrical machine 10 of the present disclosure includes: a stator 100; a low-speed rotor 200 provided inside the stator 100, the low-speed rotor having a plurality of pole pieces 201 arranged in a circumferential direction; a high-speed rotor 300 provided inside the low-speed rotor 200, the high-speed rotor including a plurality of second magnets 301 as magnets facing the pole piece 201; the magnetic gear rotating electrical machine is provided with: a first piezoelectric element 203 that is provided on the pole piece 201 and converts vibration and an electric signal; and a control unit 204 connected to the first piezoelectric element 203, for suppressing vibration of the pole piece 201 based on the output voltage of the first piezoelectric element 203.

(2) In the magnetic gear rotary electric machine 10, the plurality of first magnets 101, which are magnets arranged in a row in the circumferential direction, are arranged on the stator 100 or between the stator 100 and the low-speed rotor 200, and the first magnets 101 face the second magnets 301.

The magnetic gear rotating electrical machine 10 includes the first magnet 101 in the stator 100 to damp vibration of the pole piece 201 of the low-speed rotor 200 of the magnetic gear rotating electrical machine 10. This can improve the durability of the magnetic gear rotating electric machine 10.

(3) The first piezoelectric element 203 of the magnetic gear rotating electrical machine 10 is provided in the vicinity of the stator 202 that fixes the pole piece 201 and the low-speed rotor 200.

The first piezoelectric element 203 is provided in the vicinity of the stator 202, which is a portion where the deformation of the pole piece 201 increases. This improves the vibration damping effect of the first piezoelectric element 203 in the magnetic gear rotating electrical machine 10.

(4) The magnetic gear rotating electrical machine 10 includes a circuit connected to the first piezoelectric element 203 to form a closed circuit, and the control unit 204 performs control so that the circuit operates as a reactance canceling capacitor of the first piezoelectric element 203 at the resonance frequency of the pole piece 201 based on the electric signal output from the first piezoelectric element 203.

The magnetic gear rotating electrical machine 10 performs vibration damping according to the resonance frequency of the pole piece 201 that affects the durability of the pole piece 201. This can improve the durability of the magnetic gear rotating electric machine 10.

(5) The magnetic gear rotating electrical machine 10 is provided with a second piezoelectric element 205 which is provided on the pole piece 201 and converts the vibration of the pole piece and an electric signal, and the control unit 204 outputs the electric signal to the second piezoelectric element 205 based on the electric signal output from the first piezoelectric element 203.

The second piezoelectric element 205 of the magnetic gear rotating electrical machine 10 performs vibration control of the pole piece 201 based on the electric signal converted by the first piezoelectric element 203. This can improve the durability of the magnetic gear rotating electric machine 10.

(6) The magnetic gear rotating electrical machine 10 of the manufacturing method of the present disclosure includes: a stator 100; a low-speed rotor 200 provided inside the stator 100, the low-speed rotor having a plurality of pole pieces 201 arranged in a circumferential direction; a high-speed rotor 300 provided inside the low-speed rotor 200, the high-speed rotor including a plurality of second magnets 301 as magnets facing the pole pieces 201; the method for manufacturing the magnetic gear rotating electric machine 10 includes: a step of providing a piezoelectric element 203 for converting vibration and an electric signal on the pole piece 201; and a step of providing a control unit 204 connected to the piezoelectric element 203 for suppressing vibration of the pole piece 201 based on an output voltage of the piezoelectric element.

By using the manufacturing method, the user of the manufacturing method can damp the vibration of the pole piece 201 of the low-speed rotor 200 in the magnetic gear rotating electrical machine 10. This can improve the durability of the magnetic gear rotating electric machine 10.

Industrial applicability

According to the present disclosure, by damping vibration of a low-speed rotor in a magnetic gear rotating electric machine, durability of the magnetic gear rotating electric machine can be improved.

Description of the reference numerals

7, wiring;

9 a current output part;

23 current source;

24 voltage followers;

25 LPF；

10 magnetic gear rotating electrical machines;

100 stators;

101 a first magnet;

200 low speed rotor;

201 pole piece;

202, a fixing piece;

203a first piezoelectric element;

204 a control unit;

205 a second piezoelectric element;

206 support wheels;

211 a controller;

212 a virtual inductor circuit;

300 high speed rotor;

301 a second magnet;

400 a rotating shaft;

1100 computer;

1110 a processor;

1120 a main memory;

1130 a memory;

1140 interface;

rp equivalent resistance component;

an Rv resistance;

cp equivalent capacitance component;

an Lv inductance component;

fr resonance frequency;

fn natural frequency;

v1 output voltage;

va output voltage;

vp equivalent alternating current voltage source;

y1 admittance;

i1 current;

is adds current.

Claims

1. A magnetic gear rotating electrical machine is provided with: a stator; a low-speed rotor provided inside the stator, the low-speed rotor having a plurality of pole pieces arranged in a circumferential direction; a high-speed rotor provided inside the low-speed rotor, the high-speed rotor including a plurality of second magnets that are magnets facing the pole pieces; the disclosed device is characterized by being provided with:

a first piezoelectric element disposed on the pole piece for converting vibration and an electric signal;

and a control unit connected to the first piezoelectric element, and configured to suppress vibration of the pole piece based on an output voltage of the first piezoelectric element.

2. The magnetic gear rotary electric machine according to claim 1,

a plurality of first magnets, which are magnets arranged in the circumferential direction, are arranged on the stator or between the stator and the low-speed rotor,

the first magnet is opposed to the second magnet.

3. A magnetic gear rotary electric machine according to claim 1 or claim 2,

the first piezoelectric element is provided in the vicinity of a fixing member that fixes the pole piece and the low-speed rotor.

4. The magnetic gear rotary electric machine according to any one of claims 1 to 3,

a circuit connected to the first piezoelectric element to form a closed circuit,

the control unit controls the circuit to operate as a reactance that cancels out a capacitance component of the first piezoelectric element at a resonance frequency of the pole piece, based on the electric signal output by the first piezoelectric element.

5. The magnetic gear rotary electric machine according to any one of claims 1 to 4,

a second piezoelectric element arranged on the pole piece for converting the vibration of the pole piece and the electric signal,

the control unit outputs an electric signal to the second piezoelectric element based on the electric signal output from the first piezoelectric element.

6. A manufacturing method for a magnetic gear rotating electric machine, comprising: a stator; a low-speed rotor provided inside the stator, the low-speed rotor including a plurality of pole pieces arranged in a circumferential direction; a high-speed rotor provided inside the low-speed rotor, the high-speed rotor including a plurality of second magnets that are magnets facing the pole pieces; it is characterized by comprising:

a step of providing a piezoelectric element for converting vibration and an electric signal on the pole piece;

and providing a control unit connected to the piezoelectric element, the control unit suppressing vibration of the pole piece based on an output voltage of the piezoelectric element.